Dear All,

when analysing a diketo compound {6-Chloro isatin or 6-chloro-1H-indol-2,3-dione} we observed two major peaks in both gc and lc. some of our project mates telling that there exhibits a keto enol tautomerism exhibits and so the results.

I guess it must be some other process impurities simply based on that keto-enol tautomerism can't resolved well under chromatographic conditions.

we welcome your suggestion.